Clamshell bucket



Aug. 11-, 1925. l' ',549,538

L. HARRINGTON CLAMSHELL BUCKET Filed Feb. 25, 19 25 Patented Aug. 11, 1925.

UNITED STATES rsiasss PATENT orrice.

EDWARD L. HARRINGTON, OF ERIE, PENNSYLVANIA, ASSIGNOR- TO G. H. WILLIAIMS COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CLAMSI-IELL BUCKET.

Application filed February 25, 1925. Serial No. 11,514.

To all I l/2072b it may concern:

Be it known that 1, lilo-warn) L. lTlARR1NG- row, a citizen of the United States. residing at Erie. in the county t Erie and State of Pennsylvania. have invented new and usetul ln'lprovements in Clamshell Buckets, of which the following" is a specification.

This invention is designed to improve the opening and closing of clam shell bucke s and is ot particular advantage with clam shell buckets of the wide opening type. Among the advantages of the invention are the small clearance required for the apparatus when closed. and the freedom trout obstruction between the buckets when opened. together with the great simplicity and strength of construction. Other features and details of the invention. will 2.3136211 from the. specification and claims.

The invention is illustrated in the accompanying drawings as follows:-

Fig. 1 shows a side elevation of the bucket in open position.

Fig. 2 a similar View with the bucket in closed position.

Fig. 3 a partial bottom view with the parts in the position shown in Fig. l.

1 marks the scoops, and 9. the scoop arms extending from the scoops. These have the braces 3 making the arms rigid with the scoops and these arms are pivotally connect ed by pins at at their upper ends, the arms interlocking at the pivot in the usual manner. Corner bars 5 are pivotally connected by pins (5 at the outer corners of the scoops and are secured together at their upper ends and provided with bell crank arms 7 which are pivotally connected by a pin 8.

Toggle links 9 are connected by pins 10 arranged in the corner bars at the angle of the bell cranks formed between the corner bars and the arms 7. The links 9 are secured together by a pin 11 and to a hoisting cross head 12. Holding lines 13 are secured to the cross head and chains 14 extend from the cross head to the pins 10 limiting the swinging movement of the cross head relatively to the corner bars.

Closing levers 15 are pivotally connected by pins 16 at their lower end. They are provided with hubs or bosses 17 intermediate their ends which are arranged between the scoop arms 2 and pivotally connected with the scoop arms by pins 18. The outer ends of the closing levers 15 are in the form 01 loops 1?) forming an intervening slot in which are mounted the sheaves 20.

Closing lines ill extend through guides 1?. in the cross head 12 around sheaves 23. The sheaves 23 are journalod on pins {it in the frame formed by the comiection between the corner bars 5 at their upper end. 'lhe hoisting lines extendaround the sheaves 2t and their our are. secured to a link hung by means ot a link so on the pin In the operation of the device. blttl'i'lllfl with the open position shown in Fig. 1, as the hoisting line is actuated it exerts pressure on the closing levers l5; and this pressure is communicated first in a relatively upward direction on thev arms '2. the pins it; torming a common :inlcrum on which the levers turn. As the scoops close and the arms 9. swing upwardly the upper ends ot the levers 15 swing toward each other and in the tinal closing movement the closure; strain is communicated laterally on the arms 2 through the eii'ort of the cables drawing the upper ends of the lovers 15 together and with this closing moven'ient oi? the lovers forcing a closing movement of he arms and scoops. It will be noted that with the scoop in closed position the upper ends of the scoop arms may be brought into close proximity to the upper ends of the corner bar in other words, the mechanism requ res practically no space between the frame formed by the corner l ars and the ends oi the arms. Consequently the clearance of the scoop which is of importance in some situations is materially reduced. It. will also be observed that in the open position the closing levers, which are below the arms, are very nearly in line with the arms and consequently otter practically no obstruction to a lowering of the scoops into engagement with the material which is operated upon.

hat I claim-as new is 2-- 1. In a clam shell bucket, the combination of two scoops; scoop arms extending from the scoops and pivotally connected; scoop actuating levers pivotally connected at their lower ends and pivotally connected intermediate their ends with the arms: and means operating on the upper ends ot' the lovers to actuate the scoops.

In a clam shell bucket, the combination of two scoops; scoop arms extending "from the scoops and pivotally connected; scoop actuating levers pivotally connected at their lower ends and pivotally connected intermediate their ends with the arms between the pivotal connections of the arms and the scoops; and means operating on the upper ends of the levers to actuate the scoops.

3. In a clam shell bucket, the combination of two scoops; scoop arms extending from the scoops and pivot-ally connected; closing levers pivotally connected at their lower ends and pivotally connected intermediate their ends with the arms; and closing means acting on the upper ends of the levers.

4.111 a clam shell bucket, the combination of two scoops; scoop arms extending from the scoops and pivotally connected; closing levers pivotally connected at their lower ends and pivotally connected intermediate their ends with the arms; and clos ing means actin on the upper ends of the levers comprising sheaves on the upper ends of the arms, and cable means operating on the sheaves.

5. In a clam shell bucket, the combination of two scoops; scoop arms extending from the scoops and pivotally connected;

closing levers pivotally connected at their lower ends and pivotally connected intermediate their ends with the arms; and closing means acting on the upper ends of the levers comprising a hoisting cable.

6. In a clam shell bucket, the combination of two scoops; corner bars pivotally connected to the scoops, said bars in the form of bell cranks pivotally connected at their upper ends; closing means acting on the scoops connected to the corner bars; and a holding line acting on the corner bars each side of their pivotal connection.

7. In a clam shell bucket, the combination of two scoops; corner bars in the form of bell cranks pivotally connected to the scoops and to each other at their upper ends; closing means acting on the scoops and connected to the corner bars; and a holdin line acting on the corner bars each side or their pivotal connection through a toggle interposed between the holding line and the bell cranks.

In testimony whereof I have hereunto set my hand.

E. L. HARRINGTON 

